Awesome. Thanks for the help; I love it when the answer is intuitive. To be frank, I'm just glad that I didn't get re-directed to
Revvy's bottling tips (which is awesome, by the way

).
As an aside, wouldn't it seem that leaving an identical amount of headroom in a bottle with 10 extra ounces of beer (and a correpsonding extra amount of priming sugar) would result in extra carbonation in the 22ozs compared to the 12ozs? Probably more of a theoretical question, but still...